Siemens SIMATIC TI525 - Systems with Local and Distributed I;O

INSTALLATION
3-21
Hardware and Installation User Manual
You may connect up to 14 additional base assemblies to your system, as shown in
Figure 3-17. These additional bases constitute the distributed I/O and are
numbered from 2 to 15.
Local I/O
Distributed
I/O
T o other bases T o other bases
Power
supply
Logical
base 0
Logical
base 1
Logical
base A
Logical
base B
Logical
base C
Logical
base D
TI525/TI535 PLC
* The PPX:525–1 102 does not support distributed I/O.
PPX:505–6830
IOCC
PPX:505–6840
DBC
PPX:505–6840
DBC
Figure 3-17 Systems with Local and Distributed I/O
The I/O modules in the distributed bases communicate with the PLC through
base controllers. The Series 505 Distributed Base Controller (DBC)
(PPX:505–6840) in each distributed base assembly transmits all information
from the I/O modules in that base assembly to the I/O Channel Controller
(IOCC)
(PPX:505–6830) .
A system with distributed I/O requires one IOCC, located in the primary base.
Depending upon the cable used, the line drivers of the DBC and the IOCC
permit distributed I/O to be up to 1300 feet (396 m) from the PLC.
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